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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 29.0.5): 30.0.1.1
Operating system and version (eg, Ubuntu 24.04): debian 12.7
Apache or nginx version (eg, Apache 2.4.25): apache/2.4.62
PHP version (eg, 8.3): 8.2.24
The issue you are facing:
since I updated nextcloud to 30.x, I get the error “internal server error”
updates to RC2, … did not help
Should I update php to 8.3?
Is this the first time you’ve seen this error? Y
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
PASTE HERE
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => '*',
'passwordsalt' => '*',
'secret' => '*',
'trusted_domains' =>
array (
0 => '*.spdns.org',
1 => '*.spdns.de',
2 => '*.spdns.eu',
3 => '*.dyndns.org',
4 => '*',
5 => '*.fritz.box',
6 => '<localIP>',
),
'datadirectory' => '/hdd1/nextcloud/data',
'dbtype' => 'mysql',
'version' => '30.0.1.1',
'overwrite.cli.url' => 'http://*/nextcloud',
'overwritehost' => '*.spdns.org',
'dbname' => 'nextclouddb',
'dbhost' => '<db-server>',
'dbport' => '3306',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => '*',
'dbpassword' => '*',
'installed' => true,
'mail_smtpmode' => 'sendmail',
'mail_sendmailmode' => 'pipe',
'default_phone_region' => 'DE',
'log_type' => 'file',
'logfile' => '/var/log/nextcloud.log',
'loglevel' => 3,
'logdateformat' => 'c',
'maintenance' => false,
'theme' => '',
'mail_from_address' => '*',
'mail_domain' => '*',
'mail_smtphost' => '*',
'mail_smtpport' => '25',
'enable_previews' => 'false',
'data-fingerprint' => '*',
);
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
{"reqId":"*","level":3,"time":"*+00:00","remoteAddr":"*","user":"--","app":"encryption","method":"GET","url":"/nextcloud/","message":"/appinfo/app.php is not loaded when \\OCP\\AppFramework\\Bootstrap\\IBootstrap on the application class is used. Migrate everything from app.php to the Application class.","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:131.0) Gecko/20100101 Firefox/131.0","version":"30.0.1.1","data":{"app":"encryption"}}
{"reqId":"*","level":3,"time":"*","remoteAddr":"*","user":"--","app":"index","method":"GET","url":"/nextcloud/","message":"Class \"OCA\\Dashboard\\Controller\\LayoutApiController\" does not exist","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:131.0) Gecko/20100101 Firefox/131.0","version":"30.0.1.1","exception":{"Exception":"ReflectionException","Message":"Class \"OCA\\Dashboard\\Controller\\LayoutApiController\" does not exist","Code":-1,"Trace":[{"file":"/var/www/nextcloud/lib/private/Route/Router.php","line":450,"function":"__construct","class":"ReflectionClass","type":"->"},{"file":"/var/www/nextcloud/lib/private/Route/Router.php","line":410,"function":"getAttributeRoutes","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/nextcloud/lib/private/Route/Router.php","line":120,"function":"loadAttributeRoutes","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/nextcloud/lib/private/Route/Router.php","line":260,"function":"loadRoutes","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/nextcloud/lib/private/Route/Router.php","line":294,"function":"findMatchingRoute","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/nextcloud/lib/base.php","line":1001,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/nextcloud/index.php","line":24,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/nextcloud/lib/private/Route/Router.php","Line":450,"message":"Class \"OCA\\Dashboard\\Controller\\LayoutApiController\" does not exist","exception":{},"CustomMessage":"Class \"OCA\\Dashboard\\Controller\\LayoutApiController\" does not exist"}}